Jeeome de peeeiea



(No Model.)

J. DE PEREIRA.

FURNACE GRATE.

No. 375,136. Patented Dec. 20, 1887.

, G .U 1% V v i I l 7 M1 Tfly m m 3 J W 1 H n r W W A M 1 y H W? W F H M hm INVENTYOR ((0% WITNESSES i ATTORNEYS.

UNITED STATES JEROME DE PEEEIRA,

PATENT OFFICE.

OF NEW YORK," N. Y.

FU RNACE-GRATE.

SPECIFICATION forming part of Letters Patent No. 375,136, dated December 20, 1887.

Application filed June 18, 1887. Serial No. 241.742. (No model.)

To aZZ whom it may concern.-

Be it known that I, JEROME DE PEREIRA, of the city, county, and State of New York, have invented a new and Improved Furnace Grate, of which the following is a full, clear, and exact description.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in both the figures.

Figure l is a broken front elevation of the fire-box of a furnace having my invention ap plied thereto, and Fig. 2 is a sectional plan view of the same taken on the line 00 a; of Fig. 1.

The invention will first be described in connection with the drawings and then pointed out in the claim.

A represents the walls of the lower portion of a furnace; B, the doors to the ashpit, and O the door through which fuel is supplied to the grate-bars D D and E E. The bars D D (three or more in number at each side of the box) are journaled in the front and back walls of the furnace and are fluted longitudinally, and the front gudgeons, D, thereof reach through the front wall of the furnace. The central bars, E, (three or more in the center,) are likewise journaled in the walls of the furnace and are circumferentially fluted, and the front gudgeons, E, thereof reach some distance through the front wall of the furnace. Upon the gudgeons D are secured the pinions F E, which mesh with each other and form atrain of gearing for revolving all of the grate-bars from the single crank-shaft G. The gudgeon D of one of the side bars, D, is somewhat longer than the other gudgeons, and upon it is secured the large power gear-wheel H, and with this meshes the pinion H, secured upon the crank-shaft G, so that the revolution of the crank-shaft by the crank G will turn the outer side bar, D, and cause rotary IDO- tion to be transmitted through the train of v gearing to all of the bars composing the grate, which will cause a rapid and uniform raking of the ashes and clinkers into the ash-pit.

The circumferentially-fiuted bars E are arranged in the center of the furnace immediately in front of the furnace-door and receive the fuel. As the fuel burns it is shifted by a poker to each side of the furnace upon the longitudinallyfiuted rollers, where it is entirely reduced to ashes. A comparativelysniall quantity of ashes is. formed at the center of the furnace, and hence the circumferentiallyfluted bars serve at this point to discharge them into the ash-pit below, while they also serve to retain all small or fine fuel, so there is no waste of fuel, as would be the case if longitudinallyfluted bars were used in the center. At the sides of the furnace (if well attended by a competent fireman) the conditions are exactly reversed. Here there is no fine fuel to save, as in the center. The ashes accumulate here in abundance, and also clinkers, which is not the case at the center of the furnace; hence I place the longitudinallyfiuted grate-bars at the sides, which not only freely discharge the ashes,but graspthe clinkers and crush them and drop them int-o the ash-pit. I avoid all crushing action at the center of the furnace, which would waste fuel, and yet get rid of all of the free fine ashes.

Having thus described my invention, what I claim as new,and desire to secure by Letters Patent, isp The combination, with a furnace, of aseries of circumferentially-fluted grate-bars, E, and a series of longitudinally-fluted gratebars, D, at each side of the furnace, and a train of gearing, substantially as described, for revolving the gratebars, as and for the purposes set forth.

JEROME DE PEREIRA.

\Vitnesses:

G. F. MUELLER, FERDINAND ZACHAN. 

